JPH0813642A - Resonator type sound-absorbing body and sound-absorbing ceiling - Google Patents
Resonator type sound-absorbing body and sound-absorbing ceilingInfo
- Publication number
- JPH0813642A JPH0813642A JP6152276A JP15227694A JPH0813642A JP H0813642 A JPH0813642 A JP H0813642A JP 6152276 A JP6152276 A JP 6152276A JP 15227694 A JP15227694 A JP 15227694A JP H0813642 A JPH0813642 A JP H0813642A
- Authority
- JP
- Japan
- Prior art keywords
- sound
- resonator
- cylindrical body
- type sound
- sound absorbing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Building Environments (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ヘルムホルツ共鳴器
の原理を利用した共鳴器型吸音体と、その共鳴器型吸音
体を天井面に吊り下げて装着した吸音天井に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonator type sound absorbing body using the principle of Helmholtz resonator, and a sound absorbing ceiling in which the resonator type sound absorbing body is suspended and mounted on a ceiling surface.
【０００２】[0002]
【従来の技術】従来、共鳴器型吸音体としては、図１８
に示すように、壁面Ｗと平行に間隔Ｌをあけて、複数の
孔２１a(直径ｄ)を有する平板２１(厚さｌ)を配置した
ものがある。この共鳴器型吸音体は、平板２１と壁面Ｗ
との間の空間を孔２１aに対応するように点線で区画さ
れた複数の仮想空間を仮定すると、その区画された空間
と平板１２の孔２１aとで複数のヘルムホルツ共鳴器を
構成していると考えられる。このヘルムホルツ共鳴器の
ヘルムホルツ共振周波数ｆrは、孔２１aの長さをｌ,開
孔断面積をｓとし、孔２１a一個当たりの仮想空間の容
積をＶとすると、 ｆr ＝ ｃ／(２π)・(ｓ／(Ｖ(ｌ＋δ))1/2
(δ：管端補正値) で求められる。なお、上記平板２１の孔２１aの形状が
円の場合は、管端補正値δ＝０．８ｄとなる。こうし
て、上記共鳴器型吸音体は、複数のヘルムホルツ共鳴器
によって、ヘルムホルツ共振周波数ｆrの音域の吸音率
の高い特性を有している。2. Description of the Related Art Conventionally, as a resonator type sound absorbing body, FIG.
There is a flat plate 21 (thickness l) having a plurality of holes 21a (diameter d) arranged at intervals L parallel to the wall surface W as shown in FIG. This resonator-type sound absorber has a flat plate 21 and a wall surface W.
Assuming a plurality of virtual spaces divided by dotted lines so as to correspond to the holes 21a, the space between and the holes and the holes 21a of the flat plate 12 form a plurality of Helmholtz resonators. Conceivable. The Helmholtz resonance frequency fr of this Helmholtz resonator is fr = c / (2π). (1) where l is the length of the hole 21a, s is the cross-sectional area of the hole, and V is the volume of the virtual space per hole 21a. s / (V (l + δ)) 1/2
(δ: pipe end correction value) When the shape of the hole 21a of the flat plate 21 is circular, the pipe end correction value δ = 0.8d. Thus, the resonator-type sound absorbing body has a characteristic that the sound absorption coefficient in the sound range of the Helmholtz resonance frequency fr is high due to the plurality of Helmholtz resonators.
【０００３】また、もう一つの共鳴器型吸音体として
は、図１９に示すように、複数の孔２２a(直径ｄ)を有
する平板２２(厚さｌ)の一方の平面側に、各孔２２aに
対応して断面略二等辺三角形状に仕切板２３を夫々設け
て、複数の略三角柱状の空間を形成したものがある(特
開昭５４−７７４１４号公報参照)。この共鳴器型吸音
体は、上記空間の断面の二等辺三角形の等しい二辺のな
す頂点から平板２１までの間隔を２Ｌとして、平板２２
の仕切板２３側の平面に面する略三角柱状の空間の容積
を、図１８の共鳴器型吸音体のヘルムホルツ共鳴器の空
間の容積Ｖと同一にしているので、図１８の共鳴器型吸
音体と同一のヘルムホルツ共振周波数ｆrを有してい
る。この図１９に示す共鳴器型吸音体は、上述の平板２
１と壁面Ｗとの間に仕切りのない共鳴器型吸音体に比べ
て、吸音特性が向上する。As another resonator-type sound absorbing body, as shown in FIG. 19, each hole 22a is provided on one flat surface side of a flat plate 22 (thickness l) having a plurality of holes 22a (diameter d). Corresponding to the above, there is a partition plate 23 having a substantially isosceles triangular cross section to form a plurality of substantially triangular prism-shaped spaces (see Japanese Patent Laid-Open No. 54-77414). In this resonator-type sound absorber, the flat plate 22 has a space of 2L from the vertex formed by two equal sides of an isosceles triangle of the cross section of the space to the flat plate 21.
Since the volume of the substantially triangular prism-shaped space facing the flat surface on the partition plate 23 side is the same as the volume V of the Helmholtz resonator space of the resonator-type sound absorber of FIG. 18, the resonator-type sound absorption of FIG. It has the same Helmholtz resonance frequency fr as the body. The resonator type sound absorber shown in FIG.
The sound absorbing characteristic is improved as compared with the resonator type sound absorbing body having no partition between the wall 1 and the wall surface W.
【０００４】[0004]
【発明が解決しようとする課題】ところで、図１８,図
１９に示す共鳴器型吸音体は、ヘルムホルツ共振周波数
ｆr近傍の狭い音域に対しては高い吸音率を示すが、そ
れ以外の周波数の音に対しては吸音が十分でないという
欠点がある。The resonator-type sound absorbers shown in FIGS. 18 and 19 have a high sound absorption coefficient in a narrow sound range near the Helmholtz resonance frequency fr, but sound of other frequencies. However, there is a drawback that the sound absorption is not sufficient.
【０００５】また、図１８,図１９に示す共鳴器型吸音
体と、５００Ｈz以上の中高域の周波数の音に対して高
い吸音率を有する一方、５００Ｈz未満の低音域の周波
数の音に対して吸音率が十分でない多孔質型吸音体とを
組み合せて、広い音域の音に対応できる吸音特性を得る
ことができる。ところが、図１８,図１９に示す共鳴器
型吸音体は、ヘルムホルツ共振周波数ｆr近傍の狭い音
域でしか高い吸音性能を有しないので、筒体の有孔板の
開効率や筒体の内面に面する空間の容積を変えて、複数
の共振周波数に対応する複数種類の共鳴器型吸音体を組
み合せる必要があるため、製作コストが高くつくという
欠点がある。Further, the resonator type sound absorber shown in FIGS. 18 and 19 has a high sound absorption coefficient for sounds in the middle and high frequencies of 500 Hz or more, while it has a high sound absorption coefficient for the sounds in the low frequencies of less than 500 Hz. By combining with a porous sound absorber having an insufficient sound absorption coefficient, it is possible to obtain sound absorption characteristics capable of dealing with sounds in a wide sound range. However, since the resonator-type sound absorbers shown in FIGS. 18 and 19 have high sound absorbing performance only in a narrow sound range near the Helmholtz resonance frequency fr, the opening efficiency of the perforated plate of the cylinder and the surface of the inner surface of the cylinder are small. Since it is necessary to change the volume of the space to be combined and to combine a plurality of types of resonator-type sound absorbers corresponding to a plurality of resonance frequencies, there is a drawback that the manufacturing cost is high.
【０００６】そこで、この発明の目的は、ヘルムホルツ
共振周波数以外の周波数の音域の吸音能力を備えて、そ
れら二つの周波数の音域を合わせた広い範囲の音域の吸
音率を高くできる共鳴器型吸音体を提供することにあ
る。Therefore, an object of the present invention is to provide a resonator-type sound absorber having a sound absorbing ability in a frequency range other than the Helmholtz resonance frequency and capable of increasing a sound absorption coefficient in a wide range in which the two frequency ranges are combined. To provide.
【０００７】また、この発明のもう一つの目的は、少な
い種類の共鳴器型吸音体と多孔質型吸音体との組み合せ
ることによって、低音域から高音域までの広い音域に対
応する吸音性能を有する吸音天井を提供することにあ
る。Another object of the present invention is to improve the sound absorbing performance corresponding to a wide sound range from a low sound range to a high sound range by combining a small number of resonator type sound absorbing bodies and porous type sound absorbing bodies. It is to provide a sound absorbing ceiling having.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の共鳴器型吸音体は、所定の開口率を有す
る有孔板からなる断面略矩形状の筒体と、上記筒体の内
周に、上記筒体の対角線上に沿って上記筒体の軸と平行
に設けられた遮音材からなる第１仕切板と、上記筒体の
内周に、上記筒体のもう一方の対角線上に沿って上記筒
体の軸と平行かつ上記第１仕切板と交差するように設け
られた遮音材からなる第２仕切板と、上記筒体の両端の
開口部分を閉じる遮音材からなる密閉蓋とを備えたこと
を特徴としている。In order to achieve the above object, a resonator-type sound absorbing body according to claim 1 is a cylindrical body having a substantially rectangular cross section and comprising a perforated plate having a predetermined aperture ratio. A first partition plate made of a sound insulating material provided on the inner circumference of the cylinder parallel to the axis of the cylinder along the diagonal line of the cylinder, and on the inner circumference of the cylinder the other of the cylinder A second partition plate made of a sound insulating material that is provided along a diagonal line so as to be parallel to the axis of the cylindrical body and intersect with the first partition plate, and a sound insulating material that closes the opening portions at both ends of the cylindrical body. It is characterized by having a sealing lid.
【０００９】また、請求項２の共鳴器型吸音体は、請求
項１の共鳴器型吸音体において、上記筒体内の上記第
１,第２仕切板によって仕切られた４つの空間内に夫々
設けられ、上記空間よりも小さい容積で上記筒体の内面
に面する空間を形成する遮音材からなる調整用仕切板を
設けたことを特徴としている。The resonator-type sound absorber according to claim 2 is the resonator-type sound absorber according to claim 1, wherein the resonator-type sound absorber is provided in each of the four spaces partitioned by the first and second partition plates in the cylindrical body. In addition, an adjusting partition plate made of a sound insulating material that forms a space facing the inner surface of the cylindrical body with a volume smaller than the space is provided.
【００１０】また、請求項３の共鳴器型吸音体は、請求
項１または２に記載の共鳴器型吸音体において、上記筒
体の断面の略矩形の一方の辺の長さをｌ0とし、上記筒
体内の上記第１,第２仕切板によって仕切られた４つの
上記空間の容積と上記筒体の有孔板の開口率および上記
有孔板の孔の長さに基づく共振周波数を、５００Ｈz以
下にし、かつ周波数ｃ／(４ｌ0)(ただし、ｃは音速)と
一致しないようにすることを特徴としている。The resonator-type sound absorber according to claim 3 is the resonator-type sound absorber according to claim 1 or 2, wherein the length of one side of the substantially rectangular section of the cylindrical body is l 0. , The resonance frequency based on the volumes of the four spaces partitioned by the first and second partition plates in the cylinder, the aperture ratio of the perforated plate of the cylinder, and the length of the hole of the perforated plate, It is characterized in that it is set to 500 Hz or less and does not match the frequency c / (4l 0 ), where c is the speed of sound.
【００１１】また、請求項４の共鳴器型吸音体は、請求
項３に記載の共鳴器型吸音体において、上記筒体の軸方
向の長さをｌ1とし、上記筒体内の上記第１,第２仕切板
によって仕切られた４つの上記空間の容積と上記筒体の
有孔板の開口率および上記有孔板の孔の長さに基づく共
振周波数を周波数ｃ／(４ｌ1)(ただし、ｃは音速)と一
致しないようにすることを特徴としている。A resonator-type sound absorber according to a fourth aspect of the present invention is the resonator-type sound absorber according to the third aspect, wherein the axial length of the tubular body is set to l 1 and the first internal body of the tubular body is set. Then, the resonance frequency based on the volumes of the four spaces partitioned by the second partition plate, the aperture ratio of the perforated plate of the tubular body, and the length of the hole of the perforated plate is defined as frequency c / (4l 1 ) (however, , C is the speed of sound).
【００１２】また、請求項５の共鳴器型吸音体は、請求
項１乃至４のいずれか一つの共鳴器型吸音体と、多孔質
吸音体とを天井面から懸垂装着したことを特徴としてい
る。A resonator-type sound absorber according to claim 5 is characterized in that the resonator-type sound absorber according to any one of claims 1 to 4 and a porous sound absorber are suspended from a ceiling surface. .
【００１３】[0013]
【作用】上記請求項１の共鳴器型吸音体によれば、上記
筒体内の上記第１,第２仕切板に仕切られた４つ空間に
よって、４つのヘルムホルツ共鳴器を形成して、上記空
間の容積と有孔板の開口率および有孔板の孔の長さ等に
基づいて、一つのヘルムホルツ共振周波数近傍の狭い音
域の吸音率を高くする。また、上記筒体の断面の略矩形
の二辺の長さと筒体の軸方向の長さに基づく周波数の音
域に対しても吸音率を高くする。According to the resonator-type sound absorbing body of claim 1, four Helmholtz resonators are formed by the four spaces partitioned by the first and second partition plates in the cylindrical body, The sound absorption coefficient in a narrow sound range near one Helmholtz resonance frequency is increased based on the volume, the aperture ratio of the perforated plate, the length of the hole of the perforated plate, and the like. Further, the sound absorption coefficient is increased also in the sound range of the frequency based on the length of the two sides of the substantially rectangular section of the tubular body and the axial length of the tubular body.
【００１４】したがって、上記筒体の断面の略矩形の二
辺の長さと筒体の軸方向の長さに基づく周波数のうちの
少なくとも一つの周波数の音域とヘルムホルツ共振周波
数の音域とが一致しないようにすると、異なる周波数の
音域の吸音率を高くでき、広い範囲の音域の吸音特性を
得ることができる。Therefore, the range of at least one of the frequencies based on the two sides of the substantially rectangular section of the cylinder and the length in the axial direction of the cylinder does not match the range of the Helmholtz resonance frequency. With this, the sound absorption coefficient in the sound range of different frequencies can be increased, and the sound absorption characteristics in a wide range of sound range can be obtained.
【００１５】また、上記請求項２の共鳴器型吸音体によ
れば、請求項１の共鳴器型吸音体において、上記調整用
仕切板によって、筒体の内面に面する４つの空間の容積
を夫々調整して、ヘルムホルツ共振周波数を任意に調整
できる。また、上記４つの空間の容積を夫々異なるよう
に調整することで、最大４種類のヘルムホルツ共振周波
数に対応する吸音特性を有する共鳴器型吸音体を実現で
きる。According to the resonator-type sound absorber of claim 2, in the resonator-type sound absorber of claim 1, the volumes of the four spaces facing the inner surface of the cylindrical body are adjusted by the adjusting partition plate. The Helmholtz resonance frequency can be arbitrarily adjusted by adjusting each. Further, by adjusting the volumes of the four spaces so as to be different from each other, it is possible to realize a resonator-type sound absorbing body having sound absorbing characteristics corresponding to a maximum of four types of Helmholtz resonance frequencies.
【００１６】また、上記請求項３の共鳴器型吸音体によ
れば、請求項１または２の共鳴器型吸音体において、上
記筒体の断面の略矩形の一方の辺の長さをｌ0とし、上
記筒体内の上記第１,第２仕切板によって仕切られた４
つの空間の容積と筒体の有孔板の開口率および有孔板の
孔の長さに基づくヘルムホルツ共振周波数を、５００Ｈ
z以下にし、かつヘルムホルツ共振周波数が周波数ｃ／
(４ｌ0)と一致しないようにする(ただし、ｃは音速)。
したがって、上記ヘルムホルツ共振周波数と筒体の断面
の略矩形の一方の辺の長さｌ0に基づく周波数との異な
る周波数の音域の吸音率を高くでき、低音域において吸
音率の高い範囲を広くできる。According to the resonator-type sound absorber of claim 3, in the resonator-type sound absorber of claim 1 or 2, the length of one side of the substantially rectangular section of the cylindrical body is l 0. And is partitioned by the first and second partition plates in the cylinder body.
The Helmholtz resonance frequency based on the volume of one space, the aperture ratio of the perforated plate of the cylindrical body, and the length of the hole of the perforated plate is set to 500 H.
z or less and the Helmholtz resonance frequency is frequency c /
(4l 0 ) does not match (however, c is the speed of sound).
Therefore, it is possible to increase the sound absorption coefficient in the frequency range different from the Helmholtz resonance frequency and the frequency based on the length l 0 of one side of the substantially rectangular section of the tubular body, and to widen the range of high sound absorption rate in the low frequency range. .
【００１７】また、上記請求項４の共鳴器型吸音体によ
れば、請求項３の共鳴器型吸音体において、上記筒体の
軸方向の長さをｌ1とし、上記筒体内の上記第１,第２仕
切板によって仕切られた４つの空間の容積と筒体の有孔
板の開口率および有孔板の孔の長さに基づくヘルムホル
ツ共振周波数を周波数ｃ／(４ｌ1)と一致しないように
する(ただし、ｃは音速)。したがって、上記ヘルムホル
ツ共振周波数と筒体の軸方向の長さｌ1に基づく周波数
と異なる周波数の音域の吸音率を高くでき、低音域にお
いて吸音率の高い範囲を広くできる。According to the resonator-type sound absorbing body of claim 4, in the resonator-type sound absorbing body of claim 3, the axial length of the cylindrical body is set to l 1, and The Helmholtz resonance frequency based on the volumes of the four spaces partitioned by the first and second partition plates, the aperture ratio of the perforated plate of the cylindrical body, and the length of the holes of the perforated plate does not match the frequency c / (4l 1 ). (However, c is the speed of sound). Therefore, it is possible to increase the sound absorption coefficient in the sound range of the Helmholtz resonance frequency and the frequency different from the frequency based on the axial length l 1 of the cylindrical body, and it is possible to widen the range of the high sound absorption rate in the low sound range.
【００１８】また、上記請求項５の吸音天井によれば、
請求項１乃至４のいずれか一つの共鳴器型吸音体によっ
て低音域の吸音率を高くすると共に、多孔質吸音体によ
って中高音域の吸音率を高くする。上記共鳴器型吸音体
は、ヘルムホルツ共振周波数と上記筒体の断面略矩形の
二辺の長さと筒体の軸方向の長さに基づく周波数の異な
る周波数の音域の吸音特性を有し、少ない種類の共鳴器
型吸音体で低音域に対して吸音率の高い吸音特性を得る
ことができる。したがって、少ない種類の共鳴器型吸音
体と多孔質吸音体とを組み合せて、広い音域に渡って吸
音率の高い吸音天井を実現できる。According to the sound absorbing ceiling of claim 5,
The resonator-type sound absorber according to any one of claims 1 to 4 enhances the sound absorption coefficient in the low sound range, and the porous sound absorber increases the sound absorption coefficient in the middle and high sound range. The resonator-type sound absorbing body has a Helmholtz resonance frequency, sound absorption characteristics in a range of frequencies having different frequencies based on the lengths of two sides of the substantially rectangular cross section of the cylindrical body and the axial length of the cylindrical body, and there are few types. With this resonator type sound absorber, it is possible to obtain sound absorption characteristics having a high sound absorption coefficient in the low sound range. Therefore, it is possible to realize a sound absorbing ceiling having a high sound absorbing coefficient over a wide sound range by combining a small number of resonator-type sound absorbing bodies and porous sound absorbing bodies.
【００１９】[0019]
【実施例】以下、この発明の共鳴器型吸音体を一実施例
により詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The resonator type sound absorber of the present invention will be described in detail below with reference to an embodiment.
【００２０】図１はこの発明の一実施例の共鳴器型吸音
体の斜視図を示し、図２は有孔板１０の正面から見た図
を示している。また、図３は上記共鳴器型吸音体の側面
図を示し、図４は図２のIV−IV線から見た断面図を示
し、図５は図３のV−V線から見た断面図を示している。FIG. 1 is a perspective view of a resonator type sound absorbing body according to an embodiment of the present invention, and FIG. 2 is a view of a perforated plate 10 as viewed from the front. 3 shows a side view of the resonator-type sound absorbing body, FIG. 4 shows a sectional view taken along line IV-IV of FIG. 2, and FIG. 5 shows a sectional view taken along line V-V of FIG. Is shown.
【００２１】図１において、１は断面略正方形で一辺の
長さｌ0が４５０mmの立方体状の筒体、２は上記筒体１
の内周に、筒体１の対角線に沿って筒体１の軸に平行に
設けられた遮音材の一例としての珪酸カルシウム板から
なる第１仕切板、３は上記筒体１の内周に、筒体１のも
う一方の対角線に沿って筒体１の軸と平行かつ第１仕切
板２と交差するように設けられた遮音材の一例としての
珪酸カルシウム板からなる第２仕切板である。上記筒体
１は、珪酸カルシウム板からなる略長方形状の４つの有
孔板１０の隣接する長辺を互いに合わせて、断面略Ｌ字
形状の枠６(図２に示す)と略正方形状の枠７(図３に示
す)により固定され、断面略正方形状の筒を形成してい
る。なお、上記有孔板１０には、格子状に配列された複
数の孔１０aを形成して、所定の開口率を有するように
している。また、図１の筒体１の開口部分には図示して
いないが、図３,図５に示すように、筒体１の両端の開
口部分を略正方形状の密閉蓋４で密閉している。そし
て、上記各密閉蓋４に平行かつ密閉蓋４のコーナー部近
傍に吊りフック５(図２,図３,図４に示す)を夫々固定し
ている。また、上記第１仕切板２と第２仕切板３を予め
交差する部分で二つに分割して、その分割された４つの
仕切板を組み合わせて、筒体１内に固定している。In FIG. 1, reference numeral 1 is a cubic tube having a substantially square cross section and one side having a length l 0 of 450 mm. 2 is the tube 1 described above.
The first partition plate 3 made of calcium silicate plate, which is an example of a sound insulating material, is provided on the inner circumference of the cylinder 1 in parallel with the axis of the cylinder 1 along the diagonal line of the cylinder 1. A second partition plate made of a calcium silicate plate as an example of a sound insulating material provided along the other diagonal line of the cylinder body 1 in parallel with the axis of the cylinder body 1 and intersecting with the first partition plate 2. . The tubular body 1 has four substantially rectangular perforated plates 10 made of a calcium silicate plate, whose adjacent long sides are aligned with each other, and has a frame 6 (shown in FIG. 2) having a substantially L-shaped cross section and a substantially square shape. It is fixed by a frame 7 (shown in FIG. 3) and forms a cylinder having a substantially square cross section. The perforated plate 10 has a plurality of holes 10a arranged in a grid pattern so as to have a predetermined aperture ratio. Although not shown in the opening portion of the tubular body 1 in FIG. 1, the opening portions at both ends of the tubular body 1 are sealed by a substantially square sealing lid 4 as shown in FIGS. 3 and 5. . Then, hanging hooks 5 (shown in FIGS. 2, 3, and 4) are fixed in parallel to the respective sealing lids 4 and near the corners of the sealing lids 4, respectively. Further, the first partition plate 2 and the second partition plate 3 are divided into two at the intersecting portions in advance, and the four divided partition plates are combined and fixed in the cylindrical body 1.
【００２２】上記構成の共鳴器型吸音体において、上記
４つの有孔板１０の背後すなわち筒体１の内周には、第
１仕切板２,第２仕切板３および密閉蓋４で囲まれた略
三角柱形状の４つの空間を形成し、この空間の容積と有
孔板１０の開口率と有孔板１０の孔１０aの長さ等に基
づいて、特定の共振周波数の音域において高い吸音率を
有するヘルムホルツ共鳴器を構成している。上記有孔板
１０の孔１０aの部分の空気がヘルムホルツ共振周波数
ｆrで振動し、そのときの摩擦熱として音のエネルギー
を消費して、ヘルムホルツ共振周波数ｆr付近の極めて
狭い周波数範囲に鋭い吸音特性を有するのである。In the resonator-type sound absorber having the above structure, the first partition plate 2, the second partition plate 3 and the sealing lid 4 are surrounded behind the four perforated plates 10, that is, on the inner periphery of the cylindrical body 1. Based on the volume of this space, the aperture ratio of the perforated plate 10, the length of the holes 10a of the perforated plate 10, and the like, a high sound absorption coefficient in a sound range of a specific resonance frequency is formed. To form a Helmholtz resonator. The air in the hole 10a of the perforated plate 10 vibrates at the Helmholtz resonance frequency fr and consumes sound energy as friction heat at that time to provide a sharp sound absorption characteristic in an extremely narrow frequency range near the Helmholtz resonance frequency fr. To have.
【００２３】ところが、上記共鳴器型吸音体を残響室
(図示せず)内に吊り下げて、その共鳴器型吸音体を残響
室法吸音率の測定法(ＪＩＳ Ａ １４０９)を用いて吸音
率を測定すると、図６に示すように、△印で示す吸音特
性が得られた。なお、○印は比較のための図１８に示す
壁面Ｗに平行に平板２１を配置した場合の吸音特性であ
り、□印は図１８に示す平板２１の背後に略三角柱形状
の空間を形成した場合の吸音特性である。However, the resonator-type sound absorber is used in the reverberation room.
When the sound absorption coefficient of the resonator type sound absorber is measured by using the sound absorption coefficient measurement method (JIS A 1409) of the reverberation room method, the sound absorption coefficient is indicated by a triangle as shown in FIG. The sound absorption characteristics shown were obtained. For the purpose of comparison, a circle indicates a sound absorption characteristic when the flat plate 21 is arranged in parallel to the wall surface W shown in FIG. 18, and a square indicates a substantially triangular prism-shaped space behind the flat plate 21 shown in FIG. This is the sound absorption characteristic in the case.
【００２４】すなわち、上記共鳴器型吸音体のヘルムホ
ルツ共振周波数ｆrは、上記空間の容積と有孔板１０の
開口率および有孔板１０の孔１０aの長さで決定された
約２５０Ｈzとしている。しかしながら、上記共鳴器型
吸音体の吸音特性は、ヘルムホルツ共振周波数より低い
周波数ｆ0すなわち筒体１の断面略正方形の一辺の長さ
ｌ0の約４倍の波長となる周波数の音域において、吸音
率が高くなることが実験により知見された。なお、上記
共鳴器型吸音体の筒体１の開口率を０．８〜３％の範囲
で変えたり、筒体１の軸方向の長さｌ1を変えたりして
も、周波数ｆ0に変化はなかった。さらに、上記筒体１
の断面の正方形の一辺の長さをｌ0を３００mm、上記筒
体１の軸方向の長さｌ1を６００mmとして、上述と同様
の測定を行ったが、周波数ｃ／(４ｌ0)および周波数ｃ
／(４ｌ1)(ただし、ｃは音速)との二つの異なる周波数
の音域の吸音率の向上を示す吸音特性が得られた。That is, the Helmholtz resonance frequency fr of the resonator-type sound absorber is set to about 250 Hz determined by the volume of the space, the aperture ratio of the perforated plate 10 and the length of the hole 10a of the perforated plate 10. However, sound absorption characteristic of the resonator-type sound absorber is the range of frequencies of approximately 4 times the wavelength of the length l 0 of a side of a substantially square section of the Helmholtz resonance frequency lower than the frequency f 0 That cylindrical body 1, sound absorbing It was found by experiments that the rate was high. Even if the aperture ratio of the cylindrical body 1 of the resonator-type sound absorbing body is changed in the range of 0.8 to 3% or the axial length l 1 of the cylindrical body 1 is changed, the frequency f 0 is obtained. There was no change. Further, the cylindrical body 1
Of square cross-section of one side length of l 0 300 mm, the axial direction of the cylinder 1 a length l 1 as 600 mm, were subjected to the same measurements as those described above, the frequency c / (4l 0) and frequency c
/ (4l 1 ) (where c is the speed of sound), and sound absorption characteristics showing an improvement in the sound absorption coefficient in the sound range of two different frequencies were obtained.
【００２５】また、上記実施例では、筒体１を有孔板１
０で形成しているが、その有孔板１０を多孔質板とし
て、上述と同様の測定を行ったが、周波数ｃ／(４ｌ0)
および周波数ｃ／(４ｌ1)(ただし、ｃは音速)との二つ
の異なる周波数の音域の吸音率の向上を示す吸音特性が
得られた。In the above embodiment, the cylindrical body 1 is replaced by the perforated plate 1.
Although it is formed by 0, the perforated plate 10 was used as a porous plate and the same measurement as the above was performed, but the frequency c / (4l 0 )
And sound absorption characteristics showing an improvement in sound absorption coefficient in the sound range of two different frequencies, ie, frequency c / (4l 1 ) (where c is the speed of sound).
【００２６】以上のことから、上記筒体１の断面の略正
方形の一辺の長さｌ0と筒体１の軸方向の長さｌ1によっ
て、ヘルムホルツ共鳴器とは異なる吸音特性がこの共鳴
器型吸音体に有することが確認された。From the above, depending on the length l 0 of one side of the substantially square section of the cylindrical body 1 and the axial length l 1 of the cylindrical body 1, sound absorption characteristics different from those of the Helmholtz resonator are obtained. It was confirmed that the mold sound absorber had it.
【００２７】このように、上記筒体１内の有孔板１０と
第１,２仕切板２,３と密閉蓋４に囲まれる４つ空間によ
って、４つのヘルムホルツ共鳴器を形成して、上記空間
の容積と有孔板１０の開口率および有孔板１０の孔１０
aの長さ等に基づいて、ヘルムホルツ共振周波数ｆr近傍
の狭い音域の吸音率を高くすると共に、筒体１の略正方
形の一辺の長さｌ0に基づく周波数ｆ0の音域に対しても
吸音率を高くする。したがって、上記筒体１の断面の略
正方形の一辺の長さｌ0を変えて、ヘルムホルツ共振周
波数ｆrと周波数ｆ0とが一致しないようにして、二つの
異なる周波数の音域の吸音率を高くできる。また、上記
筒体１の軸方向の長さｌ1に基づく周波数の音域に対し
ても高い吸音率を有するので、その長さｌ1を変えて、
ヘルムホルツ共振周波数ｆrと筒体１の軸方向の長さｌ1
に基づく周波数とが一致しないようにして、異なる周波
数の音域の吸音率を高くできる。As described above, four Helmholtz resonators are formed by the four spaces surrounded by the perforated plate 10, the first and second partition plates 2 and 3 and the sealing lid 4 in the cylindrical body 1, Volume of space, aperture ratio of perforated plate 10 and holes 10 of perforated plate 10
Based on the length of a, etc., the sound absorption coefficient in a narrow sound range near the Helmholtz resonance frequency fr is increased, and sound absorption is also performed in the sound range of frequency f 0 based on the length l 0 of one side of the substantially square body 1. Increase the rate. Therefore, by changing the length l 0 of one side of the substantially square section of the cylindrical body 1 so that the Helmholtz resonance frequency fr and the frequency f 0 do not match, the sound absorption coefficient in the sound range of two different frequencies can be increased. . Further, since it has a high sound absorption coefficient in the frequency range based on the axial length l 1 of the cylindrical body 1, the length l 1 is changed to
Helmholtz resonance frequency fr and axial length l 1 of the cylindrical body 1
It is possible to increase the sound absorption coefficient in the sound range of different frequencies by preventing the frequencies based on the.
【００２８】したがって、低音域において広い範囲の吸
音特性を有する共鳴器型吸音体を実現することができ
る。Therefore, it is possible to realize a resonator-type sound absorbing body having a wide range of sound absorbing characteristics in the low sound range.
【００２９】また、図８に示すように、上記筒体１の有
孔板１０の内周側にグラスウールからなる吸音材１１を
張り付けたり、図９に示すように、筒体１の内周全体に
グラスウールからなる吸音材１２を満たしたりしてもよ
い。この場合、上記有孔板１０の背後に設けられた吸音
材１１,１２によって、有孔板１０の孔１０aの部分の流
れ抵抗が増大するので、吸音率をさらに高めることがで
きる。Further, as shown in FIG. 8, a sound absorbing material 11 made of glass wool is adhered to the inner peripheral side of the perforated plate 10 of the cylindrical body 1, or as shown in FIG. Alternatively, the sound absorbing material 12 made of glass wool may be filled. In this case, since the sound absorbing materials 11 and 12 provided behind the perforated plate 10 increase the flow resistance of the hole 10a of the perforated plate 10, the sound absorption coefficient can be further increased.
【００３０】また、図１０に示すように、筒体１の内周
の第１,第２仕切板２,３に仕切られた各空間の断面を略
台形状になるように４つの調整用仕切板１３を取り付け
て、筒体１の有孔板１０の内面に面する空間の容積を小
さくしてもよい。また、図１１に示すように、筒体１の
内周の第１,第２仕切板２,３によって仕切られた断面略
三角形状の各空間の一方の鋭角をなす頂点からその頂点
に対向する辺に延びる直線に沿って筒体１の軸に平行に
調整用仕切板１４を取り付けて、筒体１の有孔板１０の
内面に面する空間の容積を小さくしてもよい。さらに、
図１２に示すように、筒体１の内周の第１,第２仕切板
２,３によって仕切られた各空間内に断面略くの字形状
の調整用仕切板１５を取り付けて、筒体１の有孔板１０
の内面に面する空間の容積を小さくしてもよい。このよ
うにして、上記筒体１の内面に面する空間の容積を調整
することによって、ヘルムホルツ共振周波数ｆrを調整
することができる。しかも、上記筒体１内の４つの空間
の容積を夫々異なる容積に調整することができるので、
最大４つのヘルムホルツ共振周波数を有する共鳴器型吸
音体を実現することができる。Further, as shown in FIG. 10, four adjusting partitions are provided so that the cross section of each space partitioned by the first and second partition plates 2 and 3 on the inner periphery of the cylindrical body 1 becomes substantially trapezoidal. The plate 13 may be attached to reduce the volume of the space facing the inner surface of the perforated plate 10 of the tubular body 1. In addition, as shown in FIG. 11, one of the acute-angled apexes of each space having a substantially triangular cross-section partitioned by the first and second partition plates 2 and 3 on the inner periphery of the cylindrical body 1 faces the apex. The volume of the space facing the inner surface of the perforated plate 10 of the cylinder 1 may be reduced by mounting the adjusting partition plate 14 parallel to the axis of the cylinder 1 along a straight line extending to the side. further,
As shown in FIG. 12, an adjusting partition plate 15 having a substantially V-shaped cross section is attached in each space partitioned by the first and second partition plates 2 and 3 on the inner periphery of the cylindrical body 1, Perforated plate 10
The volume of the space facing the inner surface may be reduced. In this way, the Helmholtz resonance frequency fr can be adjusted by adjusting the volume of the space facing the inner surface of the cylindrical body 1. Moreover, since the volumes of the four spaces in the cylindrical body 1 can be adjusted to different volumes,
It is possible to realize a resonator-type sound absorber having a maximum of four Helmholtz resonance frequencies.
【００３１】また、図１３,図１４は多孔質吸音体の一
例を示し、この多孔質吸音体は、断面略正方形状の多孔
質材料としてのロックウール２０からなる筒体１１と、
その筒体１１の開口部分を密閉する珪酸カルシウム板か
らなる密閉蓋１４と、上記筒体１１の内周に、筒体１１
の対角線に沿って筒体１１の軸に平行に内周を仕切るよ
うに固定された珪酸カルシウム板からなる第１仕切板１
２と、上記筒体１１の内周に、第１仕切板１２に直交
し、筒体１１のもう一方の対角線に沿って筒体１１の軸
と平行に内周を仕切るように固定された珪酸カルシウム
板からなる第２仕切板１３とを備え、各密閉蓋１４の平
面に平行かつコーナー部近傍に吊りフック１５を夫々固
定している。この多孔質吸音体の少なくとも一つを図示
しない天井面から吊りフック１５,１５を用いて懸垂装
着すると共に、図７に示すように、上記実施例の共鳴器
型吸音体を天井面から吊りフック５,５を用いて懸垂装
着することによって、多孔質吸音体は中高音域の吸音率
を高くすると共に、共鳴器型吸音体は低音域の吸音率を
高くする。上記共鳴器型吸音体は、ヘルムホルツ共振周
波数と、筒体１の断面略正方形の一辺の長さと筒体１の
軸方向の長さに基づく周波数との異なる周波数の音域の
吸音特性を有し、少ない種類の共鳴器型吸音体で低音域
において広い吸音特性を得ることができる。したがっ
て、上記多孔質吸音体と少ない種類の共鳴器型吸音体と
を組み合せて、低音域から高音域の広い範囲に渡って吸
音率の高い吸音天井を実現することができる。13 and 14 show an example of a porous sound absorbing body, which is a cylindrical body 11 made of rock wool 20 as a porous material having a substantially square cross section,
A sealing lid 14 made of a calcium silicate plate for sealing the opening of the tubular body 11 and the tubular body 11 on the inner circumference of the tubular body 11.
First partition plate 1 made of calcium silicate plate fixed so as to partition the inner periphery parallel to the axis of the cylinder 11 along the diagonal line of
2 and the silicic acid fixed to the inner circumference of the cylindrical body 11 so as to be orthogonal to the first partition plate 12 and to partition the inner circumference along the other diagonal line of the cylindrical body 11 in parallel with the axis of the cylindrical body 11. The second partition plate 13 made of a calcium plate is provided, and the hanging hooks 15 are fixed in parallel to the planes of the respective sealing lids 14 and near the corners. At least one of the porous sound absorbers is suspended from the ceiling surface (not shown) by using the hanging hooks 15 and 15, and as shown in FIG. 7, the resonator-type sound absorber of the above embodiment is hung from the ceiling surface. By using 5 and 5, the porous sound absorber increases the sound absorption coefficient in the mid-high range and the resonator-type sound absorber increases the sound absorption rate in the low sound range. The resonator-type sound absorber has sound absorption characteristics in a sound range of different frequencies between a Helmholtz resonance frequency and a frequency based on the length of one side of the substantially square section of the cylinder 1 and the length in the axial direction of the cylinder 1. A wide range of sound absorption characteristics can be obtained in the low sound range with a few types of resonator-type sound absorbers. Therefore, it is possible to realize a sound absorbing ceiling having a high sound absorbing coefficient in a wide range from a low sound range to a high sound range by combining the porous sound absorbing body with a small number of resonator type sound absorbing bodies.
【００３２】上記共鳴器型吸音体および多孔質吸音体
は、天井面から個々に独立させて懸吊してもよい。The resonator-type sound absorbing body and the porous sound absorbing body may be suspended independently from the ceiling surface.
【００３３】また、筒体の断面が同じ複数個の共鳴器型
吸音体あるいは複数個の多孔質吸音体を、筒体の軸方向
に連結して、軸方向の長さの異なる一つ共鳴器型吸音体
あるいは多孔質吸音体を形成して、天井面から懸吊して
もよい。例えば、図１５に示すように、二つの共鳴器型
吸音体２０を軸方向に連結して、天井面から懸吊する。Further, a plurality of resonator-type sound absorbers or a plurality of porous sound absorbers having the same cross section of the tubular body are connected in the axial direction of the tubular body to form one resonator having a different axial length. A sound absorber or a porous sound absorber may be formed and suspended from the ceiling surface. For example, as shown in FIG. 15, two resonator-type sound absorbers 20 are axially connected and suspended from the ceiling surface.
【００３４】また、筒体の断面略正方形の一辺と軸方向
の長さが同じ複数個の共鳴器型吸音体あるいは複数個の
多孔質吸音体を、各筒体の軸が平行でかつ軸直角方向に
併設して連結し、軸に直角方向の辺の長さの異なる共鳴
器型吸音体あるいは多孔質吸音体を形成して、天井面か
ら懸吊してもよい。例えば、図１６に示すように、二つ
の共鳴器型吸音体３０を各軸が平行でかつ軸直角方向に
連結して、天井面から懸吊する。Further, a plurality of resonator-type sound absorbers or a plurality of porous sound absorbers having the same length in the axial direction as one side of the substantially square cross section of the tubular body are arranged such that the axes of the respective tubular bodies are parallel and perpendicular to each other. Alternatively, the resonator-type sound absorbers or the porous sound absorbers having different lengths of sides perpendicular to the axis may be formed side by side and connected, and may be suspended from the ceiling surface. For example, as shown in FIG. 16, two resonator-type sound absorbers 30 are connected to each other with their axes parallel and perpendicular to each other and suspended from the ceiling surface.
【００３５】このように、１種類の共鳴器型吸音体ある
いは多孔質吸音体を複数個並べて連結すると、辺の長さ
の異なる多種類の共鳴器型吸音体あるいは多孔質吸音体
を形成でき、異なる辺の長さに基づいて多種の周波数の
吸音特性を有する吸音体が得られる。As described above, by arranging and connecting a plurality of resonator-type sound absorbing bodies or porous sound-absorbing bodies arranged side by side, various kinds of resonator-type sound absorbing bodies or porous sound-absorbing bodies having different side lengths can be formed, A sound absorber having sound absorbing characteristics of various frequencies can be obtained based on the lengths of different sides.
【００３６】また、共鳴器型吸音体と多孔質吸音体を、
筒体の軸方向に連結するか、あるいは筒体の軸に直角方
向に併設し連結するか、あるいは筒体の軸方向および軸
に直角方向に併設し連結する等、任意に組み合わせて連
結して異なる形状の吸音体を形成して、天井面から懸吊
してもよい。例えば、図１７に示すように、筒体の断面
が同じ共鳴器型吸音体４０と多孔質吸音体を軸方向に連
結して、天井面から懸吊してもよい。Further, the resonator-type sound absorber and the porous sound absorber are
Connect in any direction, such as connecting in the axial direction of the cylinder, or by connecting in parallel with the axis of the cylinder at right angles, or by connecting in the direction of the axis of the cylinder and at right angles to the axis. The sound absorbers having different shapes may be formed and suspended from the ceiling surface. For example, as shown in FIG. 17, a resonator-type sound absorber 40 and a porous sound absorber having the same cross section of the cylinder may be axially connected and suspended from the ceiling surface.
【００３７】また、多孔質吸音体は、上記実施例の矩形
断面の筒体状に限らず、円筒状、板状、球状等、天井面
から懸吊可能なものであれば全て使用できる。Further, the porous sound absorbing body is not limited to the cylindrical body having the rectangular cross section of the above embodiment, and any cylindrical sound absorbing body such as a cylindrical shape, a plate shape, a spherical shape or the like that can be suspended from the ceiling surface can be used.
【００３８】また、上記実施例の図１３に示す多孔質吸
音体において、筒体１１の断面正方形の辺の長さをｌ2
および、筒体１１の軸方向の長さをｌ3とし、各々の長
さｌ2,ｌ3に基づく周波数ｃ／(４ｌ2)および周波数ｃ／
(４ｌ3)(ただし、ｃは音速)とを５００Ｈz以下にしても
よい。この場合、５００Ｈz以下の低音域の周波数の音
に対して吸音率が十分でない多孔質吸音体に、低音域に
対応できる吸音特性を持たせることができる。Further, in the porous sound absorbing body shown in FIG. 13 of the above embodiment, the length of the side of the square section of the cylindrical body 11 is l 2
Further, the axial length of the cylindrical body 11 is set to l 3, and the frequency c / (4l 2 ) and the frequency c / based on the respective lengths l 2 and l 3
(4l 3 ) (where c is the speed of sound) may be 500 Hz or less. In this case, it is possible to give the porous sound absorbing body whose sound absorption coefficient is not sufficient for the sound of the low frequency range of 500 Hz or less to the sound absorption characteristic capable of supporting the low frequency range.
【００３９】上記実施例では、第１仕切板２と第２仕切
板３を交差する部分で夫々二つに分割して、４つの仕切
板を筒体１内に固定したが、上記第１仕切板または第２
仕切板のいずれか一方のみを交差する部分で二つに分割
して、筒体内に固定してもよい。In the above embodiment, the first partition plate 2 and the second partition plate 3 are each divided into two at the intersecting portions, and the four partition plates are fixed in the cylindrical body 1. Plate or second
The partition plate may be divided into two at the intersecting portion and fixed in the cylinder.
【００４０】また、上記実施例では、図８,図９に示す
筒体１内に設けた吸音材１１,１２にグラスウールを用
いたが、これに限らず、多孔質吸音材には、ロックウー
ル,フェルトおよび厚めの布類等を用いてもよい。In the above embodiment, glass wool is used as the sound absorbing materials 11 and 12 provided in the cylindrical body 1 shown in FIGS. 8 and 9, but the invention is not limited to this, and the porous sound absorbing material is rock wool. Alternatively, felt and thick cloth may be used.
【００４１】また、上記実施例では、多孔質吸音体の多
孔質材料にロックウールを用いたが、これに限らず、吸
音材には、グラスウール,木毛セメント板,木片セメント
板,フェルト,プラスチック発泡材(ポリウレタンフォー
ムまたはユリアフォーム),軟質繊維板,厚めの布類,無機
材料を焼結させて通気性を持たせたセラミック材料,無
機材料を焼結させて通気性を持たせたアルミニウムおよ
びスポンジ等を用いてもよい。Further, in the above embodiment, rock wool was used as the porous material of the porous sound absorbing body. However, the sound absorbing material is not limited to this, and glass wool, wood wool cement board, wood chip cement board, felt, plastic Foam material (polyurethane foam or urea foam), soft fiberboard, thick cloth, ceramic material made by sintering inorganic material to make it breathable, aluminum made by making inorganic material sintered to make it breathable, and A sponge or the like may be used.
【００４２】また、上記実施例では、遮音材に珪酸カル
シウム板を用いたが、これに限らず、遮音材には、合
板,プラスターボード(石膏ボード),アクリル板,プラス
チック板,ポリカーボネート板,塩化ビニル板,金属板(ア
ルミニウム板,スチール板および鉄板等),ガラス板,ハー
ドボード,インシュレーションボード,パーティクルボー
ドおよび石膏セメント板等を用いてもよい。Further, in the above embodiment, the calcium silicate plate was used as the sound insulating material, but the sound insulating material is not limited to this, and the sound insulating material may be plywood, plaster board (gypsum board), acrylic plate, plastic plate, polycarbonate plate, vinyl chloride. Plates, metal plates (aluminum plates, steel plates, iron plates, etc.), glass plates, hard boards, insulation boards, particle boards, gypsum cement boards, etc. may be used.
【００４３】また、上記実施例では、筒体１の有孔板１
０に珪酸カルシウム板を用いたが、筒体の有孔板は、上
述に列記した吸音材または遮音材のうち強度を満足する
材料に孔を形成したものでもよいのは勿論である。Further, in the above embodiment, the perforated plate 1 of the cylindrical body 1
Although the calcium silicate plate is used for the plate No. 0, it is needless to say that the perforated plate of the cylindrical body may be formed by forming a hole in the above-listed sound absorbing material or sound insulating material that satisfies the strength.
【００４４】また、上記実施例では、筒体１の断面形状
を略正方形としたが、筒体は断面略長方形状としてよ
い。この場合、ヘルムホルツ共振周波数の音域とは別
に、筒体の断面略長方形の異なる長さの二辺と筒体の軸
方向の長さに基づく３つの周波数の音域の向上を示す吸
音特性が得られる。Further, in the above embodiment, the cylindrical body 1 has a substantially square cross section, but the cylindrical body may have a substantially rectangular cross section. In this case, in addition to the sound range of the Helmholtz resonance frequency, sound absorption characteristics showing improvement in the sound range of three frequencies based on the two sides of the substantially rectangular cross section of the cylinder having different lengths and the axial length of the cylinder are obtained. .
【００４５】[0045]
【発明の効果】以上より明らかなように、請求項１の発
明の共鳴器型吸音体は、有孔板により形成され、断面略
矩形状の筒体内の第１,第２仕切板に仕切られた４つ空
間によって、４つのヘルムホルツ共鳴器を形成して、上
記空間の容積と有孔板の開口率および有孔板の孔の長さ
等に基づいて、一つのヘルムホルツ共振周波数近傍の狭
い音域の吸音率を高くすると共に、筒体の断面の略矩形
の二辺の長さと筒体の軸方向の長さに基づく周波数の音
域に対しても吸音率を高くするものである。As is apparent from the above, the resonator-type sound absorbing body of the invention of claim 1 is formed of a perforated plate and is divided into first and second partition plates in a cylindrical body having a substantially rectangular cross section. The four Helmholtz resonators are formed by the four spaces, and based on the volume of the space, the aperture ratio of the perforated plate, the length of the holes of the perforated plate, etc., a narrow sound range near one Helmholtz resonance frequency. The sound absorption coefficient is increased and the sound absorption coefficient is also increased with respect to the frequency range based on the lengths of the two sides of the substantially rectangular section of the tubular body and the axial length of the tubular body.
【００４６】したがって、請求項１の発明の共鳴器型吸
音体によれば、上記筒体の断面の略矩形の二辺の長さと
筒体の軸方向の長さに基づく周波数のうちの少なくとも
一つの周波数の音域とヘルムホルツ共振周波数とが一致
しないようにすることによって、異なる周波数の吸音率
を高くして、広い範囲の音域の吸音特性を得ることがで
きる。Therefore, according to the resonator-type sound absorbing body of the invention of claim 1, at least one of the frequencies based on the lengths of the two sides of the substantially rectangular section of the tubular body and the axial length of the tubular body. By making the sound range of one frequency and the Helmholtz resonance frequency not coincide with each other, it is possible to increase the sound absorption coefficient of different frequencies and obtain sound absorption characteristics of a wide range of sound range.
【００４７】また、請求項２の発明の共鳴器型吸音体
は、請求項１の共鳴器型吸音体において、上記筒体内の
第１,第２仕切板に仕切られた４つの空間内に、その空
間よりも小さい容積で筒体の内面に面する空間を形成す
る遮音材からなる調整用仕切板を夫々設けたので、筒体
の内面に面する各空間の容積を夫々調整して、ヘルムホ
ルツ共振周波数を任意に設定することができ、最大４種
類のヘルムホルツ共振周波数に対応する吸音特性を有す
る共鳴器型吸音体を実現することができる。Further, a resonator-type sound absorber according to a second aspect of the present invention is the resonator-type sound absorber according to the first aspect, wherein in the four spaces partitioned by the first and second partition plates in the cylindrical body, Since each of the adjusting partition plates is made of a sound insulating material that forms a space facing the inner surface of the cylinder with a volume smaller than that space, the volume of each space facing the inner surface of the cylinder is adjusted individually, and Helmholtz The resonance frequency can be set arbitrarily, and a resonator-type sound absorber having sound absorption characteristics corresponding to a maximum of four types of Helmholtz resonance frequencies can be realized.
【００４８】また、請求項３の発明の共鳴器型吸音体
は、請求項１または２の共鳴器型吸音体において、上記
筒体の断面の略矩形の一方の辺の長さをｌ0とし、筒体
内の第１,第２仕切板によって仕切られた４つの空間の
容積と筒体の有孔板の開口率および有孔板の孔の長さに
基づく共振周波数を、５００Ｈz以下とし、かつ周波数
ｃ／(４ｌ0)(ただし、ｃは音速)と一致しないようにす
るので、共振周波数と異なる周波数ｆ＝ｃ／(４ｌ0)の
音域の吸音率を高くして、５００Ｈz以下の低音域にお
いて広い範囲で吸音率を高くすることができる。A resonator-type sound absorber according to a third aspect of the present invention is the resonator-type sound absorber according to the first or second aspect, wherein the length of one side of the substantially rectangular section of the cylindrical body is l 0. The resonance frequency based on the volumes of the four spaces partitioned by the first and second partition plates in the cylinder, the aperture ratio of the perforated plate of the cylinder, and the length of the hole of the perforated plate is 500 Hz or less, and Since the frequency c / (4l 0 ) (where c is the speed of sound) does not match, the sound absorption coefficient in the frequency range f = c / (4l 0 ) different from the resonance frequency is increased to a low range of 500 Hz or less. The sound absorption coefficient can be increased in a wide range.
【００４９】また、請求項４の発明の共鳴器型吸音体
は、請求項３の共鳴器型吸音体において、上記筒体の軸
方向の長さをｌ1とし、筒体内の第１,第２仕切板によっ
て仕切られた４つの空間の容積と筒体の有孔板の開口率
および有孔板の孔の長さに基づく共振周波数を周波数ｃ
／(４ｌ1)(ただし、ｃは音速)と一致しないようにする
ので、共振周波数と異なる周波数ｆ＝ｃ／(４ｌ1)の音
域の吸音率も高くして、５００Ｈz以下の低音域におい
て、さらに広い範囲で吸音率を高くすることができる。A resonator-type sound absorber according to a fourth aspect of the present invention is the resonator-type sound absorber according to the third aspect, wherein the axial length of the tubular body is l 1 and the first and the first The resonance frequency based on the volumes of the four spaces partitioned by the two partition plates, the aperture ratio of the perforated plate of the cylindrical body, and the length of the holes of the perforated plate is defined as the frequency c.
/ (4l 1 ) (where c is the speed of sound), so that the sound absorption coefficient in the frequency range f = c / (4l 1 ) different from the resonance frequency is also high, and in the low range of 500 Hz or less, The sound absorption coefficient can be increased in a wider range.
【００５０】また、請求項５の発明の吸音天井は、請求
項１乃至４のいずれか一つの共鳴器型吸音体と、多孔質
吸音体とを天井面から懸垂装着したので、少ない種類の
共鳴器型吸音体と多孔質吸音体で広い音域において吸音
率の高い吸音天井を実現することができる。すなわち、
上記共鳴器型吸音体は、ヘルムホルツ共振周波数の音域
と筒体の断面略矩形の二辺の長さと筒体の軸方向の長さ
に基づく周波数の音域の異なる音域の吸音特性を有し、
少ない種類の共鳴器型吸音体で低音域において広い吸音
特性を得ることができ、中高音域において吸音特性を有
する多孔質吸音体とを組み合せることによって、低音域
から高音域に至る広い範囲で高い吸音率を得ることがで
きるのである。Further, in the sound absorbing ceiling of the fifth aspect of the invention, since the resonator type sound absorbing body according to any one of the first to fourth aspects and the porous sound absorbing body are suspended from the ceiling surface, a small number of types of resonance can be obtained. It is possible to realize a sound absorbing ceiling having a high sound absorbing coefficient in a wide sound range by the container type sound absorbing body and the porous sound absorbing body. That is,
The resonator-type sound absorbing body has sound absorption characteristics of different sound ranges of Helmholtz resonance frequency range and frequency range based on axial length of the cylinder and two side lengths of substantially rectangular cross section of the cylinder,
It is possible to obtain a wide range of sound absorption characteristics in the low range with a few types of resonator-type sound absorbers, and by combining it with a porous sound absorber that has sound absorption characteristics in the middle and high ranges, a wide range from the low range to the high range is achieved. It is possible to obtain a high sound absorption coefficient.
【図１】 図１はこの発明の一実施例の共鳴器型吸音体
の斜視図である。FIG. 1 is a perspective view of a resonator type sound absorber according to an embodiment of the present invention.
【図２】 図２は上記共鳴器型吸音体の有孔板の正面か
ら見た図である。FIG. 2 is a front view of a perforated plate of the resonator-type sound absorber.
【図３】 図３は上記共鳴器型吸音体の側面図である。FIG. 3 is a side view of the resonator-type sound absorber.
【図４】 図４は図２のIV−IV線から見た図である。FIG. 4 is a view as seen from a line IV-IV in FIG.
【図５】 図５は図３のV−V線から見た図である。FIG. 5 is a view as seen from the line VV in FIG.
【図６】 図６は上記共鳴器型吸音体の１／３オクター
ブバンド中心周波数に対する吸音率の関係を表わす図で
ある。FIG. 6 is a diagram showing a relationship of a sound absorption coefficient with respect to a center frequency of a 1/3 octave band of the resonator-type sound absorbing body.
【図７】 図７は上記共鳴器型吸音体を天井から吊り下
げた状態を表わす図である。FIG. 7 is a diagram showing a state where the resonator-type sound absorber is suspended from the ceiling.
【図８】 図８はこの発明の他の実施例の共鳴器型吸音
体の断面図である。FIG. 8 is a sectional view of a resonator-type sound absorbing body of another embodiment of the present invention.
【図９】 図９はこの発明の他の実施例の共鳴器型吸音
体の断面図である。FIG. 9 is a sectional view of a resonator-type sound absorbing body of another embodiment of the present invention.
【図１０】 図１０はこの発明の他の実施例の共鳴器型
吸音体の断面図である。FIG. 10 is a sectional view of a resonator-type sound absorbing body of another embodiment of the present invention.
【図１１】 図１１はこの発明の他の実施例の共鳴器型
吸音体の断面図である。FIG. 11 is a sectional view of a resonator-type sound absorbing body of another embodiment of the present invention.
【図１２】 図１２はこの発明の他の実施例の共鳴器型
吸音体の断面図である。FIG. 12 is a sectional view of a resonator-type sound absorbing body of another embodiment of the present invention.
【図１３】 図１３は多孔質吸音体を天井から吊り下げ
た状態を表わす図である。FIG. 13 is a diagram showing a state in which a porous sound absorbing body is suspended from the ceiling.
【図１４】 図１４は上記多孔質吸音体の断面図であ
る。FIG. 14 is a cross-sectional view of the porous sound absorbing body.
【図１５】 図１５は上記共鳴器型吸音体を軸方向に連
結して、天井から吊り下げた状態を表す図である。FIG. 15 is a diagram showing a state in which the resonator-type sound absorbers are axially connected and hung from the ceiling.
【図１６】 図１６は上記共鳴器型吸音体を軸直角方向
に連結して、天井から吊り下げた状態を表す図である。FIG. 16 is a diagram showing a state in which the resonator-type sound absorbers are connected in a direction perpendicular to the axis and are hung from the ceiling.
【図１７】 図１７は上記共鳴器型吸音体と多孔質吸音
体とを組み合わせて軸方向に連結し、天井から吊り下げ
た状態を示す図である。FIG. 17 is a diagram showing a state in which the resonator-type sound absorbing body and the porous sound absorbing body are combined and connected in the axial direction, and are suspended from the ceiling.
【図１８】 図１８は従来の共鳴器型吸音体の断面図で
ある。FIG. 18 is a sectional view of a conventional resonator type sound absorbing body.
【図１９】 図１９は従来の仕切板を用いた共鳴器型吸
音体の断面図である。FIG. 19 is a sectional view of a resonator-type sound absorbing body using a conventional partition plate.
１…筒体、２…第１仕切板、３…第２仕切板、４…密閉
蓋、５…吊りフック、１０…有孔板、１０a…孔。1 ... Cylindrical body, 2 ... 1st partition plate, 3 ... 2nd partition plate, 4 ... Sealing lid, 5 ... Hanging hook, 10 ... Perforated plate, 10a ... Hole.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 木村 真也 大阪府大阪市阿倍野区松崎町２丁目２番２ 号 株式会社奥村組内 (72)発明者 稲留 康一 大阪府大阪市阿倍野区松崎町２丁目２番２ 号 株式会社奥村組内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinya Kimura 2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka Okumura-gumi Co., Ltd. (72) Koichi Inaru 2-chome, Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka No. 2 No. 2 Okumura Gumi Co., Ltd.
Claims (5)
面略矩形状の筒体と、 上記筒体の内周に、上記筒体の対角線上に沿って上記筒
体の軸と平行に設けられた遮音材からなる第１仕切板
と、 上記筒体の内周に、上記筒体のもう一方の対角線上に沿
って上記筒体の軸と平行かつ上記第１仕切板と交差する
ように設けられた遮音材からなる第２仕切板と、 上記筒体の両端の開口部分を閉じる遮音材からなる密閉
蓋とを備えたことを特徴とする共鳴器型吸音体。1. A tubular body having a substantially rectangular cross-section, which comprises a perforated plate having a predetermined aperture ratio, and an inner periphery of the tubular body, which is parallel to the axis of the tubular body along a diagonal line of the tubular body. A first partition plate made of a sound-insulating material provided on the inner circumference of the tubular body along the other diagonal line of the tubular body so as to be parallel to the axis of the tubular body and intersect the first partition plate. A resonator-type sound absorbing body, comprising: a second partition plate made of a sound insulating material provided in the above; and a sealing lid made of a sound insulating material that closes openings at both ends of the cylindrical body.
て、上記筒体内の上記第１,第２仕切板によって仕切ら
れた４つの空間内に夫々設けられ、上記空間よりも小さ
い容積で上記筒体の内面に面する空間を形成する遮音材
からなる調整用仕切板を備えたことを特徴とする共鳴器
型吸音体。2. The resonator-type sound absorbing body according to claim 1, wherein each of the resonator-type sound absorbing bodies is provided in each of four spaces partitioned by the first and second partition plates in the cylindrical body and has a volume smaller than that of the space. A resonator-type sound absorber comprising an adjusting partition plate made of a sound insulating material that forms a space facing the inner surface of the cylindrical body.
体において、上記筒体の断面の略矩形の一方の辺の長さ
をｌ0とし、上記筒体内の上記第１,第２仕切板によって
仕切られた４つの上記空間の容積と上記筒体の有孔板の
開口率および上記有孔板の孔の長さに基づく共振周波数
を、５００Ｈz以下にし、かつ周波数ｃ／(４ｌ0)(ただ
し、ｃは音速)と一致しないようにすることを特徴とす
る共鳴器型吸音体。3. The resonator-type sound absorber according to claim 1 or 2, wherein the length of one side of a substantially rectangular section of the cylindrical body is set to l 0, and the first and second insides of the cylindrical body are defined. The resonance frequency based on the volumes of the four spaces partitioned by the partition plate, the aperture ratio of the perforated plate of the cylindrical body, and the length of the hole of the perforated plate is set to 500 Hz or less, and the frequency c / (4l 0 ) (Where c is the speed of sound), a resonator-type sound absorber characterized by not matching.
て、上記筒体の軸方向の長さをｌ1とし、上記筒体内の
上記第１,第２仕切板によって仕切られた４つの上記空
間の容積と上記筒体の有孔板の開口率および上記有孔板
の孔の長さに基づく共振周波数を周波数ｃ／(４ｌ1)(た
だし、ｃは音速)と一致しないようにすることを特徴と
する共鳴器型吸音体。4. The resonator-type sound absorbing body according to claim 3, wherein the length of the cylindrical body in the axial direction is l 1 and four are divided by the first and second partition plates in the cylindrical body. Resonance frequency based on the volume of the space, the aperture ratio of the perforated plate of the cylindrical body, and the length of the hole of the perforated plate should not match the frequency c / (4l 1 ) (where c is the speed of sound). A resonator-type sound absorber characterized by the above.
共鳴器型吸音体と、多孔質吸音体とを天井面から懸垂装
着したことを特徴とする吸音天井。5. A sound absorbing ceiling, wherein the resonator-type sound absorbing body according to claim 1 and a porous sound absorbing body are suspended from a ceiling surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6152276A JP3071637B2 (en) | 1994-07-04 | 1994-07-04 | Resonator type sound absorber and sound absorbing ceiling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6152276A JP3071637B2 (en) | 1994-07-04 | 1994-07-04 | Resonator type sound absorber and sound absorbing ceiling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0813642A true JPH0813642A (en) | 1996-01-16 |
| JP3071637B2 JP3071637B2 (en) | 2000-07-31 |
Family
ID=15536974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6152276A Expired - Lifetime JP3071637B2 (en) | 1994-07-04 | 1994-07-04 | Resonator type sound absorber and sound absorbing ceiling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3071637B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000000338A (en) * | 1999-10-13 | 2000-01-15 | 김규택 | Impedance matching bass trap |
| JP2003108145A (en) * | 2001-09-26 | 2003-04-11 | Kobe Steel Ltd | Soundproof member |
| RU2606018C1 (en) * | 2015-08-19 | 2017-01-10 | Олег Савельевич Кочетов | Kochetov's sound-absorbing structure |
| RU2611223C1 (en) * | 2015-09-08 | 2017-02-21 | Олег Савельевич Кочетов | Kochetov's acoustic guardrail |
| RU2630805C2 (en) * | 2016-02-08 | 2017-09-13 | Олег Савельевич Кочетов | Multi-section muffler by kochetov for reducing exhaust noise of gas-dynamic plants |
| CN107195379A (en) * | 2017-07-07 | 2017-09-22 | 重庆渝丰鑫新线缆科技有限公司 | A kind of primary and secondary signal cable for being easy to manage line |
| RU2649513C1 (en) * | 2017-02-27 | 2018-04-03 | Олег Савельевич Кочетов | Acoustic fencing with resonant elements |
| RU2649716C2 (en) * | 2015-07-27 | 2018-04-04 | Мария Олеговна Стареева | Multi-section silencer |
| RU2652845C1 (en) * | 2017-01-10 | 2018-05-03 | Олег Савельевич Кочетов | Sound absorbing structure |
| JP2019132972A (en) * | 2018-01-31 | 2019-08-08 | 積水ハウス株式会社 | Support structure of sound absorption structure |
-
1994
- 1994-07-04 JP JP6152276A patent/JP3071637B2/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000000338A (en) * | 1999-10-13 | 2000-01-15 | 김규택 | Impedance matching bass trap |
| JP2003108145A (en) * | 2001-09-26 | 2003-04-11 | Kobe Steel Ltd | Soundproof member |
| RU2649716C2 (en) * | 2015-07-27 | 2018-04-04 | Мария Олеговна Стареева | Multi-section silencer |
| RU2606018C1 (en) * | 2015-08-19 | 2017-01-10 | Олег Савельевич Кочетов | Kochetov's sound-absorbing structure |
| RU2611223C1 (en) * | 2015-09-08 | 2017-02-21 | Олег Савельевич Кочетов | Kochetov's acoustic guardrail |
| RU2630805C2 (en) * | 2016-02-08 | 2017-09-13 | Олег Савельевич Кочетов | Multi-section muffler by kochetov for reducing exhaust noise of gas-dynamic plants |
| RU2652845C1 (en) * | 2017-01-10 | 2018-05-03 | Олег Савельевич Кочетов | Sound absorbing structure |
| RU2649513C1 (en) * | 2017-02-27 | 2018-04-03 | Олег Савельевич Кочетов | Acoustic fencing with resonant elements |
| CN107195379A (en) * | 2017-07-07 | 2017-09-22 | 重庆渝丰鑫新线缆科技有限公司 | A kind of primary and secondary signal cable for being easy to manage line |
| JP2019132972A (en) * | 2018-01-31 | 2019-08-08 | 積水ハウス株式会社 | Support structure of sound absorption structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3071637B2 (en) | 2000-07-31 |
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